On Thu, Apr 25, 2013 at 7:16 PM, Steven LeBlanc <ores...@gmail.com> wrote: > Greets, > > I'm trying to learn to use nls and was running the example code for an > exponential model: > >> x <- -(1:100)/10 >> y <- 100 + 10 * exp(x / 2) + rnorm(x)/10 >> nlmod <- nls(y ~ Const + A * exp(B * x)) > Error in B * x : non-numeric argument to binary operator > In addition: Warning message: > In nls(y ~ Const + A * exp(B * x)) : > No starting values specified for some parameters. > Initializing ‘Const’ to '1.'. > Consider specifying 'start' or using a selfStart model > > Presumably, the code should work if it is part of an example on the help > page. In perusing various help forums for similar problems, it also appears > that others believe this syntax should work in the model formula. > > Any ideas? >
Try running in a clean session. Having B <- "X" in your workspace would cause such an error. -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
